vein intersomitic vein EMAPA:26056 Primary intersegmental vessels that are contacted by secondary angiogenic sprouts from the posterior cardinal vein and take on the characteristics of veins. These eventually link with other secondary sprouts from the posterior cardinal vein to form the parachordal vessel. Isogai et al. 2003.[TAO] The vein that sprouts from the posterior cardinal vein, growing dorsally between the somites, and then joining, and draining the dorsal longitudinal anastomosing vessel. segmental vein ISV SCTID:361448009 UBERON:0007679 intersegmental vein ZFA:0001057 TAO:0001057 intersomitic vessel